JPS6072334A - Antenna device for inductive radio - Google Patents

Abstract

PURPOSE:To improve the S/N ratio, minimize the antenna occupying area, and make the manufacture of the titled device easier by making electric currents which directions are alternately changed to flow through more than three conductors installed in parallel with each other to a plane and installing loop antennas between adjacent conductors, and then, connecting the antennas so that an output voltage is added. CONSTITUTION:A plane installed to a transmission line 1 is parallel with the plane of loop antennas 31-3n and when electric currents flowing in directions shown by arrows 61-6n are made to flow to conductors 51-5n lines of magnetic force interlinking with the loop antennas 31-3n and which are opposite to each other in direction are produced. Since output voltage are impressed upon a receiver 4 under a superposed condition and the line of magnetic force of noises links in the same direction at the antennas 31-3n and the noises are not received by the receiver 4 when the antennas 31-3n are coupled as shown in the figure, the S/N ratio can be improved. Moreover, since the transmission line 1 is constituted with parallel conductors 51-5n, it can be manufactured easily and, at the same time, the antenna occupying area in the direction along the line 1 can be made smaller.

Description

[Detailed Description of the Invention] (Technical Field of the Invention) Jin's invention relates to an antenna device that uses guided radio for communication in a moving body such as a train (prior art). There has been a device that uses two parallel wires as a transmission line installed along the line, and couples them with the magnetic field distributed around the two parallel wires to perform communication. but,
This device had the drawback of a poor 8/N ratio, as noise emitted from the contact between the moving object and the track was also transmitted and received in the same way as the signal.

Further, as shown in FIG. 1, a stranded wire twisted at a constant pitch is used as the transmission line (1), and a power supply terminal I2υ is connected.

There was a device in which a current with a 90° phase difference was passed through the power supply terminal (2) and +241, a rotating magnetic field was formed around the transmission line (1), and the signal was received through a loop (C111, Cl2). The direction of the interlinking magnetic fields is reversed. Therefore, when connecting the wires to the receiver (4) as shown in Figure 1,
The output voltages of the loop antenna (field) and @ are added together.

The received signal at the receiver (4) is loop antenna c+n, c
In a. It is the sum of the received signals. On the other hand, since the direction in which the magnetic field of the noise intersects with the loop antenna 13σ, (to) is the same, in the connection shown in Figure 1, the noise is canceled out and the receiver (4) does not receive the noise. .

Therefore, the S/N ratio is improved. However, with the conventional device shown in FIG. 1, it is difficult to create the transmission line (1) of twisted conductor wires, and the pitch of the twisted wires still needs to be a certain distance from the point of loss. Loop antenna +311. The disadvantage was that the distance between +321 and 321 was also long.

(Summary of the invention) This invention aims to eliminate the above-mentioned drawbacks.

Three or more parallel conducting wires are provided on a plane, and currents in different directions are passed through the conducting wires alternately, so that the conducting wires are adjacent to each other.

(Example of the invention) FIG. 2 is a diagram showing an embodiment of the invention. (1).

(4) is the same as that in Figure 1, %lI+, □□□,
..., (aa) is a loop antenna, 15+1. +
521. ..., (5n) is a conductor.

([ill, (621,-, (6n) is the direction of the current,
an, cr21. =-, (7m) is the line of magnetic force.

The plane on which the transmission line (1) is provided is a loop antenna t3
]1.

G37J,..., (: is parallel to the plane of each loop of (J).

This invention is constructed as described above.

Conductor 6υ+ 521.・, (5n) is the current direction (6
11, 1132) When a current such as t...' + (6n) flows, magnetic lines of force rtn, a'a,
... + (7m) is generated. At this time, loop antenna 311. The directions of the magnetic lines of force interlinking with C121', . (3
21,...

The output voltages of (31) will be added together. On the other hand, the magnetic lines of noise are the loop antenna +311. (321
Sh...

Since they intersect in the same direction at (31), the reception noise is canceled and the receiver (4) does not receive any noise. Therefore, S becomes better. In addition, since the transmission line (1) is composed of parallel conducting wires, it is easier to make than the conventional twisted wires, and furthermore, the loop antenna t311゜i3s, ・
..., (3/) in the direction along the transmission line (1), there is no restriction on the arrangement of the transmission line (1).
The area occupied by the antenna in the direction along K can be small.

Note that although the embodiment describes the case of receiving a signal, the present invention may also be applied to the case of transmitting a signal.

(Effects of the Invention) As described above, three conductive wires (F) are provided in parallel on a plane, and currents in different directions are passed through the conductive wires alternately.

By installing a loop antenna between adjacent conducting wires and connecting the wires so that the output voltages of each loop antenna are added together, the advantage is that the S/N ratio is good, the area occupied by the antenna can be reduced, and it is easy to manufacture. Therefore, the effects of this invention are significantly greater than those used in train induction radio antenna devices.

[Brief explanation of the drawing]

Figure 1 is a diagram showing a conventional inductive radio antenna device;
The figure shows an embodiment of the invention. In the figure, (1) is a transmission line, +211. rlJ, (
23L +241 is the power supply terminal. 131+, +3,..., (,M) is a loop antenna, (4) is a receiver. (511, (521,..., (5th line) is a conductor, +
611. +69. ..., (6n) is the direction of the current,
C7111721,..., (7m) are lines of magnetic force. Note that the same or corresponding parts in FIG. 9 are designated by the same reference numerals. Agent Masuo Oiwa Figure 1 Figure 2

Claims (1)

[Claims] In an inductive radio antenna device that communicates by coupling a transmission line and a loop antenna with a magnetic field, three or more parallel conductive wires are installed on a plane as a transmission line, and the conductive wires above the gate are alternately oriented in different directions. A current is applied, loop antennas are installed between adjacent conducting wires so that the surface of the loop becomes the plane on which the transmission line is provided, and the wires are connected so that the output voltages of each loop antenna are added together. An inductive radio antenna device characterized by: